Mentioning that our bedroom was cold brought this tip from our friend Jennifer, who is the bartender at Ditch Plains next to our home: Magnetic Sheepskin Underlays.
Hailing from Australia, where sheepskin mattress pads are very popular, the magnetic wires that run through them aid the warmth and comfort of your sleep. How? Obviously wool is very warm, and the magnets apparently aid in blood circulation, which is also good for any pain, inflamation and the cleaning out of toxins...
If you're cold at night, it's worth a try. We found a number of links for these mattress pads:
(ReEdited from 2007-02-13 - MGR)